CVE-2026-58644

Microsoft SharePoint Remote Code Execution Vulnerability

State: Published
Severity: 9.8 Critical
Published: Jul 14, 2026
Updated: Nov 1, 2026
Reserved: Jul 1, 2026

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C	microsoft

Weaknesses

CWE-502 Deserialization of Untrusted Data

Affected Products

Product	Versions
Microsoft SharePoint Enterprise Server 2016Microsoft	16.0.0 to before 16.0.5556.1005Affected
Microsoft SharePoint Server 2019Microsoft	16.0.0 to before 16.0.10417.20153Affected
Microsoft SharePoint Server Subscription EditionMicrosoft	16.0.0 to before 16.0.19725.20384Affected

References

Microsoft SharePoint Remote Code Execution Vulnerabilityvendor-advisorypatch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644government-resource

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